The 4.0-r1 release is based on the Android 4.0.4 (Ice Cream Sandwich branch). We have fixed and added x86 specified code to let the system runs smoothly on x86 platforms, especially for tablets and netbooks. The key features in this release are

Kernel 3.0.36 with KMS enabled. Most netbooks can run Android-x86 in the native resolution.

OpenGL hardware acceleration for Intel and AMD Radeon chipsets. You may disable it by adding HWACCEL=0 to the cmdline if you have trouble to enable it.